DIRECT IMAGING AND SPECTROSCOPY OF A PLANETARY-MASS CANDIDATE COMPANION TO A YOUNG SOLAR ANALOG

被引：177

作者：

Lafreniere, David ^{[1
]}

Jayawardhana, Ray ^{[1
]}

van Kerkwijk, Marten H. ^{[1
]}

机构：

[1] Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 689卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

planetary systems; stars:; low-mass; brown dwarfs; stars: pre-main-sequence;

D O I：

10.1086/595870

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Gemini near-infrared adaptive optics imaging and spectroscopy of a planetary-mass candidate companion to 1RXS J160929.1-210524, a roughly solar-mass member of the 5 Myr old Upper Scorpius association. The object, separated by 2.22 '' or 330 AU at similar to 150 pc, has infrared colors and spectra suggesting a temperature of 1800(-100)(+200) K, and spectral type of L4(-2)(+1). The H- and K-band spectra provide clear evidence of low surface gravity, and thus youth. Based on the widely used DUSTY models, we infer a mass of 8(-2)(+4) M(Jup). If gravitationally bound, this would be the lowest mass companion imaged around a normal star thus far, and its existence at such a large separation would pose a serious challenge to theories of star and planet formation.

引用

页码：L153 / L156

页数：4

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